Steganography expert Peter Wayner discusses six techniques that help obscure the data and traces you leave online. ‘The truth is, worrying about the trail of digital footprints and digital dustballs filled with our digital DNA is not just for raving paranoids. Sure, some leaks like the subtle variations in power consumed by our computers are only exploitable by teams of geniuses with big budgets, but many of the simpler ones are already being abused by identity thieves, blackmail artists, spammers, or worse.’ What tools and techniques do you use to ensure greater privacy and better security of personal data on the Web?